Hewnon Black-Skeever is a Nordwarrior plotting to overthrow or undermine the Thieves Guild in the entrance to The Ratway. He can be heard scheming with Drahff about some indiscernible plot. They will attack you on sight.

As soon as you enter the Ratway and move down the first tunnel, you will hear Hewnon and Drahff discuss their little scheme, although Hewnon is starting to doubt if the plan will ever pay off:

Hewnon: "I dunno, Drahff. They'd skin us alive if they knew we were doin' this."Drahff: "Why are you always acting like such a big baby? I've gotten us this far."Hewnon: "This far? We're livin' in a sewer. You said we'd have a house as big as the Black-Briars' by now."Drahff: "You worry about bashing people's heads in, I'll worry about the Guild. Okay?"Hewnon: "Okay, okay."Drahff: "I'm going to check the entrance to the Ratway. Be right back."